MusicalScore.js

export class MusicalScore {
  constructor ({ notes }) {
    invariant(Array.isArray(notes), 'notes must be an array')
    this._notes = notes
  }
  get notes () {
    return this._notes
  }
  static fromMIDIFile (midiBuffer) {
    let notes = [ ]
    // some scary code
    return new MusicalScore({ notes })
  }
}